An orthographic drawing, sometimes called a working drawing, is usually
the last drawing produced by a designer. It normally has three accurate
views of a product, a front view, side view and plan view. Dimensions
(measurements) are also drawn on each view, ensuring the manufacturer can
make the product to the precise size and the designers requirements. A
parts list is also included. This has the precise measurements for every
part of the product and includes details such as materials and finish.

A working drawing is required if manufacturing is to take place

The working drawing seen below is for a clock. It has been drawn in a
system called Third Angle Orthographic Projection, a world standard for
this type of presentation.

It should be possible for a designer
based in the UK, to draw an working drawing of a product and for it to be
manufactured in another country, by using only the orthographic drawing.
This is called ‘Remote Manufacture’. The orthographic drawing should be
accurate and include all the information required for manufacturing.
Designers often use this process for the design and manufacture of
products.

THIRD ANGLE ORTHOGRAPHIC DRAWING - ANIMATION

ORTHOGRAPHIC DRAWING - HOW IT IS PRESENTED TO A MANUFACTURER

Designers often use remote manufacturing, in an attempt to keep costs low.
Designers also produce working drawings so that prototypes can be
manufactured, and then tested. This leads to improvements being made to
the product. Working drawings are usually produced using CAD, although
skilled designers still draw them be hand, at least in the early stage of
the designing process. Designers find sketching in orthographic projection
very useful.

Information found on a working drawing / orthographic drawing:

All
necessary views required for manufacturing.All the necessary
measurements (called dimensions).A standard format for working
drawings.A parts list which includes all the information needed to
make each part of the product.